The text outlines a tutorial for upgrading Ruby on Rails applications using a dual boot strategy, which allows developers to incrementally upgrade their applications without disrupting ongoing feature development. This method, popularized by companies like GitHub and Shopify, involves using the ten_years_rails gem to manage dual boot environments, enabling applications to simultaneously run on both the current and next versions of Rails. The tutorial is demonstrated using Bike Index, an open-source bike registration tool, and integrates with CircleCI for continuous integration, allowing developers to test changes in both environments and ensure compatibility. By employing this strategy, developers can conduct upgrades with minimal disruption, using conditional commands to manage gem installations and CI pipeline configurations, ultimately facilitating a smoother transition to newer Rails versions.